Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d9ea6e3074aba7…

MALICIOUS

PDF

73.3 KB Created: 2021-03-16 05:52:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 898922250772742449d2f52a3e5d386f SHA-1: 73361f74f77f2616f60a6eff306bb7261558cb87 SHA-256: 79d9ea6e3074aba789a8b4b0e994ac240c0212b7831ad9833ccbe9cafb6b7bcb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a link farm, with numerous external URLs pointing to various PDF files hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/aws?utm_term=manufacturer+code+for+sentry+safe
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/murazu.pdf
    • https://cdn-cms.f-static.net/uploads/4388835/normal_602daaeb0f2d4.pdf
    • https://static.s123-cdn-static.com/uploads/4501054/normal_5fc86a8ca4d37.pdf
    • http://kerutugizuxig.mygamesonline.org/61587069979.pdf
    • http://pofuxubilet.sportsontheweb.net/second_grade_spelling_worksheets.pdf
    • http://betizekaxu.getenjoyment.net/birdland_concert_band.pdf
    • https://cdn.sqhk.co/bodujemep/k9g6hfU/fidget_spinner_coloring_pages_printable.pdf
    • https://cdn.sqhk.co/sebutarukaw/hfigrja/super_smash_bros_all_dlc_character_trailers.pdf
    • https://kufavugozit.weebly.com/uploads/1/3/5/3/135309998/7447837.pdf
    • https://nuxutesinof.weebly.com/uploads/1/3/1/4/131437012/gifapubujajodixigig.pdf
    • https://mosugomepa.weebly.com/uploads/1/3/4/0/134096926/5829530.pdf
    • https://static.s123-cdn-static.com/uploads/4458635/normal_5fde638a73b49.pdf
    • https://cdn.sqhk.co/fowizolomam/jcEifjb/xawarakofafatovofawi.pdf
    • https://cdn-cms.f-static.net/uploads/4427514/normal_6044d016dc3c1.pdf
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/3b43e151.pdf
    • https://cdn.sqhk.co/vipujitebiki/Jhiib8M/guvakalo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_2979c42336ce4c429872b22620872f90.pdf?index=true
    • http://kilarosine.atwebpages.com/streetcar_named_desire_mitch_and_blanche_scene.pdf
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_ddaa959ed8ef438bbb1629f65f60d496.pdf?index=true
    • http://wororezijetixa.atwebpages.com/is_the_serenity_prayer_found_in_the_bible.pdf
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_0202b892a6f441218aebe4ecec940233.pdf?index=true
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_5028a8f4bfd84a0e90b7356696dfbadf.pdf?index=true
    • http://padusij.onlinewebshop.net/bible_theology_books_in_telugu.pdf
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_a4a522e6f04f41b7a9ca08eab574c3e9.pdf?index=true
    • http://rawigukegopafot.onlinewebshop.net/22920444537.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e05d.bin
ace7ff5309c50a26119f3c7cfa79c9543ee17aeb628f901330e1063794036548		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 5088 bytes
font_01_sfnt_off0000f1d3.bin
3938a414ef9209d2a91824c2bef72bbfa1fed3a6312b159e10e841e6e15a1dfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 10768 bytes

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